Henry l



rra Freres Partnr erica.

HENRY L. TREBERT, OF SYRACUSE, NEW YORK, ASSlG-NOR TO E. O. STEARNS &OO., OF SAME PLACE.

FRAME-JOlNT.

SPECIFICATION forming part of Letters Patent No. 623,495, dated April18, 1899.

' Application filed May 9, 1898. Serial No. 680,093. (No model.)

To @ZZ whom t may concern:

Be it known that I, HENRY L. TREBERT, of Syracuse, in the county ofOnondaga, in the State of New York, have invented new and usefulImprovements in Frame- Joints, of which the following, taken inconnection with the accompanying drawings, is a full, clear, and exactdescription.

My invention relates to a new andimproved tube-joint to be used wheretwo tubes are inserted in or secured to a third at or about the samepoint and at different angles, and is particularly adapted for securingthe upper rear forks of a bicycle to themain upright of the frame. Theseare secured to the main upright tube at its upper end and extendoutwardly and downwardly therefrom atan angle to each other, so as toreceive between them the rear hub and wheel, and in my invention theyare secured thereto by a joint constructed as follows: The upper end ofone of these fork sides is compressed inwardly or cut out, so as to forma seat fitted to receive theupper end of the other fork side. Into therear face of the upper end of the upright is then drilled an aperture ofproper size and at a proper angle snugly to receive these upper ends.They are then inserted together,brazed in position, and the upright ismilled-out on its interior, cutting away portions of the fork sides toreceive the seat-post. It willbe seen that in cutting the aperture toreceive together the upper ends of the fork sides the upright must bedrilled at two different angles corresponding each to the angle ofoutward and downward inclination of one of the fork sides. The result ofthis is a peculiar double hole, in cutting which a considerable surfaceof contact is formed in the interior of the upright and shoulders forreceiving the ends of the fork sides. The joint so formed is strong,simple, and easy to construct. It is a ush joint without any unsightlyprojections-such as thimbles,ears, lugs,and boltsbut at the same timeeasy to braze, there being none of the objectionable interior braZ- ing;but this is all practically on the exterior,

so that there is little possibility of careless work and imperfectbrazing.

My invention will be better understood by reference to the accompanyingdrawings, in which the saine reference-numerals indicate the same partsin all the figures.

Figure 1 is a side elevation of a bicycleframe provided withlnyinvention. Fig. 2 is a portion of the same enlarged, showing theconnection between the upright and one of the fork sides. Fig. 3 is arear elevation of the upper end of the upright, showing the peculiarhole. Fig. 4 is a vertical section on line 4 4 of Fig. 3. Fig. 5 showsthe upper ends of the two fork sides, one compressed to receive theother. Fig. 6 is a top plan view of the upright, showing the fork sidesinserted therein. Fig. 7 is the same after the interior of the tube hasbeen milled out. Fig. 8 is the upper end of one fork side cut awayinstead of being compressed to receive the other.

In the iigures, l indicates the main upright or seat-post truss-tubedrilled at 2 with the peculiar double hole of such size and at such anangle as to receive snugly the fork sides as they are inserted togetherin proper position. This is best shown in Figs. 3 and 4. The double holebeing drilled at two angles of inclination corresponding to therespective angles at which the fork sides join the upright, there isformed in the interior of the upright the curved contact-surface 4,gradually widening as the drill cuts away the thickness of the metal onthe sides to 5, and at the end of the cutis form ed the shoulder 6,against which abuts the upper end of the fork side. In Figs. 5 and 6 areshown the upper ends of these fork sides 7 and 8, the upper end of 7being inwardly compressed on an incline, so as to form a bed or seat lOfor receiving the end of the other tube S. The two tubes are theninserted in aperture 2 of the upright and there brazed securely inposition, thek surfaces 4 4 5 5, shoulders 6 6, and the seat 10affording considerable brazing-surface. The whole joint is easilybrazed, there being no interior corners around which the spelter mustpass, but it runs straight into the interior of the upright and for onlya short distance, and it can be easily seen when it has passed entirelybetween the upper end of the fork side 8 and seat 10. After the brazin gthe IOO interior of the upright is milled out, cutting away theinternally-projecting ends ot" tubes 7 and S, and as their ends are noteut o' flat or plain the strain is carried around the upright on thesame principle as with a lishmouth reinforcing-piece,

In Fig. S is shown a slight modification, in which the upper end of forkside 7 is cnt away to receive fork side S instead of being compressed.This latter construction, however, I consider inferior, as it does notgive as much brazing-surface and the springing of the tubes would bemore apt to break them apart.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

l. In combination in a bicycle-frame joint,- the main upright havingconnecting and downwardly-inclined apertures cnt in its rear face nearthe upper end, said apertures being outwardly inclined from each other,and the upper rear-fork sides iitting said aperture snugly, the upperend of one fork side being compressed to form an inclined channel toreceive the upper end of the other.

2. Inabicyele-framejoint, the combination of the main upright havingupwardly and inwardly extending eonnecti11g-apertures eut in its rearface, forming contact-surfaces in the interior of the upright graduallyand .inwardly increasing in surface and terminating with a shoulder oneach side, and of the upper rear-fork sides, fitted to each other and tofill said apertures snugly.

In a bicycle-frame joint, the combination of the upright drilled on itsrearward face with conn ectin g-apertures, each formed at an anglecorresponding to the angle of inclination of the corresponding upperrearfork side to said upright, forming a contact-surface graduallyincreasing toward the interior of the tube terminating with a shoulderon each side, and in combination therewith the fork sides, the upper endone being internally compressedforming a curved seat at an angle toreceive the upper end of the other, the two fitting snugly the doubleaperture and contact-surfaces of the upright, the p0rtions of the forksides lying within the inner circumference of the upright being cutawayto permit the insertion of the seat-post.

In testimony whereof I have hereunto signed my name.

HENRY L. TREBERT.

Witnesses:

ALFRED WILKINSON, H. M. SEAMANS.

